Doing something crazy such as almost running over a drunk as he's taking a piss, causing him to jump into the pond he was pissing in. That act, my friend, would be ape-ass crazy.
"Heh... Y- y'allsApe-ass crazy!" - a dude named Billy
A reference to the movie "Fatal Attraction" when the mistress boiled the family pet to get back at the husband for the rejection. A woman that does something crazy and sometimes frightening when rejected by a man.
After I said I wanted to break it off she called my cell 20 times and drove past my house to see if there was another girl there. That girl is bunny-boilin' crazy.